<template>
  <div class="App">
    <div class="table">
      <table>
        <thead>
          <tr>
            <th>编号</th>
            <th>科目</th>
            <th>成绩</th>
            <th>考试时间</th>
            <th>操作</th>
          </tr>
        </thead>
        <tbody v-if="this.list.length !== 0">
          <!-- 渲染 -->
          <tr v-for="(item, index) in list" :key="index">
            <td>{{ item.id }}</td>
            <td>{{ item.subject }}</td>
            <td>{{ item.score }}</td>
            <td>{{ formatDate(item.date) }}</td>
            <td><a href="#" @click="del(item.id)">删除</a></td>
          </tr>
        </tbody>
        <tbody v-else>
          <tr>
            <td colspan="5">
              <span class="none">暂无数据</span>
            </td>
          </tr>
        </tbody>
        <tfoot>
          <tr>
            <td colspan="5">
              <span>总分：{{ com }}</span>
              <span style="margin-left: 50px"
                >平均分：{{
                  this.list.length === 0
                    ? '0'
                    : (com / this.list.length).toFixed(2)
                }}</span
              >
            </td>
          </tr>
        </tfoot>
      </table>
    </div>
  </div>
</template>

<script>
import moment from 'moment'
import bus from './eventBus.js'
export default {
  name: 'ScoreCase',

  data() {
    return {
      msgFromform: '',
      list: [
        {
          id: 15,
          subject: '语文',
          score: 89,
          date: new Date('2022/06/07 10:00:00'),
        },
        {
          id: 27,
          subject: '数学',
          score: 100,
          date: new Date('2022/06/07 15:00:00'),
        },
        {
          id: 32,
          subject: '英语',
          score: 56,
          date: new Date('2022/06/08 10:00:00'),
        },
        {
          id: 41,
          subject: '物理',
          score: 76,
          date: new Date('2022/06/08 10:00:00'),
        },
      ],
      subject: '',
      score: '',
    }
  },
  created() {
    bus.$on('share', (a) => {
      this.list = a
    })
  },
  methods: {
    // 格式化时间
    formatDate(a) {
      return moment(a).format('YYYY-MM-DD HH:mm:ss')
    },
    //删除
    del(i) {
      this.list = this.list.filter((item) => {
        return item.id !== i
      })
      //发送数据
      bus.$emit('share', this.list)
    },
  },
  computed: {
    com() {
      return this.list.reduce((prev, item) => {
        return prev + item.score
      }, 0)
    },
  },
}
</script>

<style lang="less">
.App {
  .table {
    flex: 4;
    table {
      width: 100%;
      border-spacing: 0;
      border-top: 1px solid #ccc;
      border-left: 1px solid #ccc;
      th {
        background: #f5f5f5;
      }
      tr:hover td {
        background: #f5f5f5;
      }
      td,
      th {
        border-bottom: 1px solid #ccc;
        border-right: 1px solid #ccc;
        text-align: center;
        padding: 10px;
        &.red {
          color: red;
        }
      }
    }
    .none {
      height: 100px;
      line-height: 100px;
      color: #999;
    }
  }
}
</style>
